Reconfigurable quantum phononic circuits via piezo-acoustomechanical interactions

Taylor, Jeffrey C.; Chatterjee, Eric; Kindel, William; Soh, Daniel B. S.; Eichenfield, Matt

doi:10.48550/arxiv.2106.05406

Cited by 1 publication

(2 citation statements)

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“…As a matter of fact, memory blocks with adjustable input-output coupling rate can be built in practice. For example, a two-sided resonator where one input-output interface is connected to a phase shifter and a high-reflective mirror has the required capability of high-speed output coupling rate adjustment [17]. Here, the adjustment of the input-output coupling is accomplished by changing the amount of phase shifting.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, one can continuously adjust the output coupling rate between zero and maximum physically achievable value. One limitation of such a system is that the time delay between the resonator and the mirror disturbs the carefully designed destructive interference between the various waves, thus lowering the transfer fidelity [17]. This issue is best resolved by engineering the system so as to minimize the resonator-mirror distance.…”

Section: Discussionmentioning

confidence: 99%

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Optimal quantum transfer from input flying qubit to lossy quantum memory

Chatterjee¹,

Soh²,

Eichenfield³

2022

J. Phys. A: Math. Theor.

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In a quantum network, a key challenge is to minimize the direct reflection of flying qubits as they couple to stationary, resonator-based memory qubits, as the reflected amplitude represents state transfer infidelity that cannot be directly recovered. Optimizing the transfer fidelity can be accomplished by dynamically varying the resonator's coupling rate to the flying qubit field. Here, we analytically derive the optimal coupling rate profile in the presence of intrinsic loss of the quantum memory using an open quantum systems method that can account for intrinsic resonator losses. We show that, since the resonator field must be initially empty, an initial amplitude in the resonator must be generated in order to cancel reflections via destructive interference; moreover, we show that this initial amplitude can be made sufficiently small as to allow the net infidelity throughout the complete transfer process to be close to unity. We then derive the time-varying resonator coupling that maximizes the state transfer fidelity as a function of the initial population and intrinsic loss rate, providing a complete protocol for optimal quantum state transfer between the flying qubit and resonator qubit. We present analytical expressions and numerical examples of the fidelities for the complete protocol using exponential and Gaussian profiles. We show that a state transfer fidelity of around 99.9% can be reached momentarily before the quantum information is lost due to the intrinsic loss in practical resonators used as quantum memories.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%